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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) $ in Millions	3 Months Ended
	Dec. 29, 2018 USD ($)
Fiscal 2018 charges
Restructuring Reserve [Roll Forward]
Balance as of September 29, 2018	$ 9.1
Fiscal 2018 charges | Fiscal 2019 Action [Member]
Restructuring Reserve [Roll Forward]
Balance as of September 29, 2018	0.0
Fiscal 2018 charges | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Balance as of September 29, 2018	4.3
Fiscal 2018 charges | Fiscal 2017 Actions
Restructuring Reserve [Roll Forward]
Balance as of September 29, 2018	0.8
Fiscal 2018 charges | Fiscal 2016 Actions
Restructuring Reserve [Roll Forward]
Balance as of September 29, 2018	3.9
Fiscal 2018 charges | Other
Restructuring Reserve [Roll Forward]
Balance as of September 29, 2018	0.1
Fiscal 2019 charges | Fiscal 2019 Action [Member]
Restructuring Reserve [Roll Forward]
Balance as of December 29, 2018	0.3
Restructuring | Fiscal 2019 charges
Restructuring Reserve [Roll Forward]
Fiscal 2019 charges	1.7
Severance payments and adjustments	(2.0)
Other payments	(0.9)
Balance as of December 29, 2018	7.9
Restructuring | Fiscal 2019 charges | Fiscal 2019 Action [Member]
Restructuring Reserve [Roll Forward]
Fiscal 2019 charges	1.0
Severance payments and adjustments	(0.7)
Other payments	0.0
Restructuring | Fiscal 2019 charges | Fiscal 2018 Actions
Restructuring Reserve [Roll Forward]
Fiscal 2019 charges	0.7
Severance payments and adjustments	(1.0)
Other payments	(0.5)
Balance as of December 29, 2018	3.5
Restructuring | Fiscal 2019 charges | Fiscal 2017 Actions
Restructuring Reserve [Roll Forward]
Fiscal 2019 charges	0.0
Severance payments and adjustments	(0.3)
Other payments	0.0
Balance as of December 29, 2018	0.5
Restructuring | Fiscal 2019 charges | Fiscal 2016 Actions
Restructuring Reserve [Roll Forward]
Fiscal 2019 charges	0.0
Severance payments and adjustments	0.0
Other payments	(0.4)
Balance as of December 29, 2018	3.5
Restructuring | Fiscal 2019 charges | Other
Restructuring Reserve [Roll Forward]
Fiscal 2019 charges	0.0
Severance payments and adjustments	0.0
Other payments	0.0
Balance as of December 29, 2018	$ 0.1

X

- Definition

Severance payments.

+ References

No definition available.

+ Details

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X

- Definition

Payments to settle other restructuring charges.

+ References

No definition available.

+ Details

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X

- Definition

Restructuring charges, gross

+ References

No definition available.

+ Details

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X

- Definition

Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 420
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 5.P.4(b))
-URI http://asc.fasb.org/extlink&oid=115931487&loc=d3e140904-122747

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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